package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /*
    新增菜品和对应的口味
     */
    @Transactional //涉及到多个表的操作，保证数据的一致性
    public void saveWithFlavor(DishDTO dishDTO){
        //向菜品表插入一条数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);//对象属性拷贝
        dishMapper.insert(dish);
        //获取inset语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors!=null && flavors.size()>0){
            //遍历一下集合
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /*
    菜品分页查询
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO>page=dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }
    /*
    菜品批量删除功能
     */
@Transactional
    public void deleteBatch(List<Long> ids) {
        //1.判断当前菜品能否删除--是否存在启售中的菜品
        for (Long id : ids) {
            Dish dish=dishMapper.getById(id);
            if (dish.getStatus()== StatusConstant.ENABLE){//dish的status等于1
                //当前菜品起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //2.判断当前菜品能否删除--是否被套餐关联
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds!=null&& setmealIds.size()>0){
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //3.可以删除，删除菜品表中的菜品数据
       /* for (Long id:ids){
            dishMapper.deleteById(id);
            //4.删除菜品关联的口味数据
            dishMapper.deleteByDishId(id);*/
    //根据菜品id集合批量删除菜品数量
    //sql: delete from dish where id in (?,?,?)
    for (Long id:ids){
        dishMapper.deleteById(id);
        //根据菜品id集合批量删除关联的口味数据
        //sql: delete from dish_flavor where dish_id in (?,?,?)
        dishFlavorMapper.deleteByDishId(id);
    }

    }
    /*
        根据id来查询菜品和口味数据
    */
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish=dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor>dishFlavors=dishFlavorMapper.getByDishId(id);
        //将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }
    /*
        根据id修改菜品基本信息和对应的口味信息
     */
    public void updateWithFlavor(DishDTO dishDTO){
        //1.操作菜品表
        //2.操作口味表  先删除口味儿，再重新插入口味
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors!=null && flavors.size()>0){
            //遍历一下集合
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

}
